I have been listening K701 since 2008, and recently I bought K812 from B&H as I want to know how relatively out of date my K701 is. To my dismay I think K812 is good, but maybe only 30% to 40% better than K701. The price difference over 1000 dollars is not justified from my perspective. Further...

Hi!   I want to ask guidance on how to use my K701 professionally. I bought them in 2008 and has used them over thousands of hours. But so far I have been only connecting them to my laptop. I want to know:   1) How to best amplify their ability? What kind of amplifier do I need to...